Automatic tension-regulator for electrical generators.



A. NICOL. AUTOMATIC TBNSIN REGULATOR FOB ELEGTRIGAL GBNEBATOBS. APPLIUATION FILED JAN, 22, 1908.

91 0,949. Patent-,ea Jan. 26, 1909.

y -r Inl/enfer Wai-ness@ s AUGUST NICL, OF BERLIN, GERMANY, ASSIGNOR T BERGM-ANNELEKTRICITATS-WERKE,

AKTIENGESELLSCHAFT, OF BERLIN,

GERMANY, A CORPORATION OF GERMANY.

AUTOMA'lIO TENSION-BEGLATOR FR ELECTRICAL GENERATORS.

Specification of Lettere Patent.

Patented Jan. 26, 1909.

Application mea January 22', isos. seen No. 412,150.

whm it may comem- Be it known that I, AUGUsT NICOL, a subject of the German Emperor, and a resident of Berlin, in the Empire of Germany, have invented certain new and useful Improvements in Automatic TensionRegulators for Electrical Generators, of which the following is a specification.

M invention relates to automatic tension regu ators for electrical generators, par- To qll ticularly such as are operated in conjunction bevel with a separate exciting generator. The regulation of the exciting current is accom- Elished, according to my present invention, y means of an auxiliary device operative intermittently to increase the tension in the exciting circuit and at the same time to accumulate energy which again reduces the tension in the exciting circuit when said device ceases to operate the adjuster. By these alternate increases and reductions the tension in the` exciting circuit is regulated promptly and in apractically even or gradual manner.

The accompan drawing illustrates in diagrammatic one way of carrying out m invention A t, reehasegenerator has its field magnet coils connected with the armature coils' of an exciting` generator I. The field coil4 M of the exciting enerator is included in. a shunt circuitA whic also includes a potentialvadjustcr. This is shown as a rhcostat E the several sections of which areconnested with sections of a stationary commutator. D e` aged by a. brush C of variable Eosltlon. his brush is connected with one rush of the exciter I, through the medium of a contact strip or brush O, the other brush of the exciter being connected rwith one end of the coil M and the other end of this coil being connected with the terminal of the variab e resistance E. From the ar- :nature coils K of the main generator the three hnezwires lead to the ace of consumption` In ashunt from these me wires is located an auxilia device consistir? of a three-phase motor The shaft of t is motor'carries a Y ear B which meshes with a bevel whee'l mounted to turn on a radial studB secr red to the same shaft C which also car ries the brush Gand` the contact rin O. To th' `shaft coiled ia further s ecured'one en oie l optingA Q, the other and of which-is low each other at very brief intervals. The

xed to a stationary support; This springstores energy dur' the time that the otenis operated by the motor A. The wheel B also meshes with a bevel gear Bs secured to a sleeve P which is loose upon the shaft Cf and carries a ring-shaped armature P. Adjacent to this armature is located an electroma net G which, when energized, acts as a bra e to o pose or prevent rotationof the armature and its sleeve P. The ma et G is included in an auxiliary shunt lea ing from two of the three wires connected with the motor A. In this auxiliary shunt is also included a switch N forming part of a voltmeter H, which has a shunt connection with two of the three line wires. This switch is so-arranged that it will close the auxiliary shunt, to energize the magnet G, whenever the tension in the main circuit falls below a certain limit.

Should the voltage in the line wires drop on account of an increase in the load, the movable member or switch N of the voltmeter H will close the auxilia shunt circuit through the magnet G. revious vto this, the gears B BS, have been rotated idly in op osite directions, by the motor A, the whee B rotating idly on the stationary stud` B. The spring Q has held the shaft C', brush C, and stud B2, stationary. As soon as the manet G is ener 'zed, the rotation of the gear s. is stopped y the attractionvof said magnet on the armature P' The wheels B B, B3, then form a planetary can ing of the welbknown character, the s aft C' turning with one-half the velocity of the lmotor shaft. This causesI 'the brush C to b e shifted to adjust the tension in the coll M and thereby m the line wires. As soon as the pro er voltage is restored in the line wires, t e voltmeter switch N opens the circuit ener 'zing the magnet G, so that the armature is released. As soon as this occurs, the spring Q, which has been put by the turnin of the shaft under tension C uncoils and brins said sha t as well asthe brush C and stud back to their normal position. l

v'llhe iuctuations of potential which cause the switch-N to 4open-and close are very rapid so that the forward and backward rocking movements of the shaft C will foltial-adjuster, or at east the brush C t ,ereofl amount of these fluctuations will be very slight, so that a practically constant tension is obtained, if the parts are properly dimensioned. On account of the practically uninterrupted regulation the apparatus will respond immediately to even slight variations of the load. In the particular case illustrated, I effect the regulation by varyinilr the current which passes through the elld coil M of the exciting generator I. It will be obvious that I might obtain the same result in various other ways, current which flows through the field coil L of the main generator, or by varying both currents at the same time.

I claim t 1. A potential regulator comprising a constant] operated auxiliary device, a potential-ac juster, mechanism for connecting the said device with said adjuster in such a manner as to increase the otential, a switch which, according to the ecrease or increase of potential throws said mechanism into or out of action, and means for storing ener while said adjuster is operated by said evice, such stored energy o erating the said adjuster for a reduction o potential when said mechanism is out of action.

2. A potential regulator comprisin a constantly operated motor, a potential-ajuster, mechanism for connecting said motor with said adjuster in such a manner as to increase the (potential, a switch which, according to the ecrease or increase of potential, throws said mechanism automatically into or out of action, and means for stori while said adjuster is operated by tie motor, such stored energy operating the said adjuster for a reduction of potential when said mechanism is out of action.

3. A potentialregulator comprising a constantly operated motor, a potential-adjuster, planetary ea for connecting the motor with the a( juster in such a manner as to 'increase the potential, an actuating device, which, accordin to the decrease or increase of otential etects an operative connection o the motor with said adjuster through the planetary gearing, or a release otthe adjuster, and means for stori energy while said adjuster is being operatii by t e motor, said stored energy operating the adjuster todecrease the potential, when said adjuster is released;

4. A potential regulator comprising a constantlly' operated auxilia device, a potentiala juster, mechanismror connecting said device with the adjuster in such a manner as to increase the potential, an actuator which, accordi to the decrease or increase of potential e ects an operative connection of said device vvith the adjuster through the said mechanism, or a release of the adjuster, and a spring which is put under tension while the adjuster is operated by said device, and

energy which upon the release of the adjuster operatcs the latter to reduce the potential.

5. A potential regulator comprising a constantly operated motor, planetary gearing driven thereby, a potential-adjuster connected with said gearing, means, controlled by a decrease or increase of potential, for arresting or releasing a member of said planetary gearing. and mechanism for storing energy while said adjuster is operated by the motor, such stored ener operating the adjuster with opposite e ect after its release from the motor.

6. A potential regulator comprising a constantly operated motor, planetary gearing driven thereby, a otential-adjuster connected with said gearing, a mechanical` magnetic, or eddy current brake, controlled by a Adecrease or increase of pot ential, for arresting or releasing a member of said planetary gearing, and mechanism for storing energy while said adjuster is operated by the motor, such stored energy o erating the adjuster WithA opposite effect a ter its release from the motor.

7. A potential regulator comprising a constantly operated motor, planeta gearing comprising three members, one o which is driven by said motor, means controlled by a decrease or increase of potential, for arresting or releasing another member of the planetai gearing, a potential-adjuster connected wit the third member of said gearing, and mechanism for storing energy While said adjuster is operated by the motor, such stored energy o erating the adjuster with opposite eiect a ter its release from the motor.

- 8. A potential regulator comprising a constantly operated motor, planeta gearing comprising three members, one o which is driven by said motor, means controlled by a decrease or increase of potential, for arresting or releasing another member of the planetary gearing, a potentialadjuster connected wit the third member of said gearing, and mechanism for eiecting a return movement of the adjusterafter its release from the motor.

9. The combination with a main generator and an auxiliary generator for exciting the field coils of the main generator, of a potential-adjuster in operative connection with the, auxiliary generator, a permanently driven device, means, controlled by variations of potential in the main circuit, for connecting the said adjuster with said device, or releasing it therefrom, and spring mechanism for effecting a return movement of the adjuster after its release from said device..

10. The combination with a main generator and an auxiliary generator for exciting the field coils of the main generator, of a potential-adjuster in operative connection with the auxiliary generator, a permanently driven device,A means cont-rolled -by variations of potential in the main circuit, for conmeeting therseid adjuster with said device, or my hand this 4th day of January, 1908, in` releasing it therernlnmhend dmeehanism for the presence of two subscribing ivltnesses. storing enerc'jv w ie t e a Auser is oierated by saidndeviee, such stoi'ed energylop-Y AUGUST NICOL' :s` erating the adjuster with opposite effect af- Witnesses:

tier its release from seid device. HENRY HASPER,

In testimony whereof, I have hereunto set 'WOLDEMAR HAUPT. 

